中文摘要：

采用电子探针、XRD和透射电镜等研究了热等静压态、固溶态、固溶＋时效处理过程中，粉末冶金不锈钢33Cr9Ni2Mo0．96N第二相的析出行为。结果表明：热等静压态的33Cr9Ni2Mo0．96N组织主要由γ＋Cr2N＋d组成，经过固溶淬火后，组织主要由奥氏体＋少量铁素体组成，经500℃和600℃时效后，33Cr9Ni2Mo0．96N中没有观察到第二相析出，经700℃时效，残余铁素体转变为σ相，同时在奥氏体晶粒及晶界处也开始析出。相，经过800℃时效，有大量的Cr2N沿晶界析出，然后向晶内长大，经900℃时效后，Cr2N不断向晶内生长，最终几乎布满整个晶粒，而σ相趋于稳定。

英文摘要：

The second phase of powder metallurgy stainless steel 33Cr9Ni2Mo0.96N occurred in HIP , solution treatment and solution and aging process was investigated by EPMA, XRD and TEM. The results show that the structure consists of 7, Cr2N and, after HIP, 7 and a little a-Fe after solution quenching and the second phase is not found after 500 ℃ aging and 600 ℃ aging. After 700 ℃ aging, the remain a-Fe and 7 starte to translate to, phase. After 800 ℃ aging, a lot of Cr2N phases precipitate from grain boundaries. After 900℃ aging, the Cr2N phases grow from grain boundaries into grains gradually and σ phase trends to stabilize.